Alright, check it out guys!

1. Angel Konan + Konan

Note: The 1st and 4th screenshots are the non-combo standard attack , the 2nd and 3rd screenshots are the combo therefore that damage is 3x of the written number. (also all screenshots were the 1st attack of the round 1 therefore no tag affected the damage)

2. Hashirama Skillbook +1 passive + Mifune

Note: Hashirama without skillbook DOESN'T STACK with Mifune as showed in my previous thread

3. Earth Main "Guidance" + 8 Gates Guy "Guidance"

Note: The 1st screenshot is with Earth Main using only guidance as buff and 2nd is without any Earth Main buffs, it's a combo attack and only +20% attack more buff so the difference is not so big but still noticable.

4. Lightning Main "Anbu Tactics"

Note: 1st screenshot is with my team-mate using Heart Flux buff for himself, 2nd is with him using Anbu Tactics, I was using Anbu Tactics in both screenshots.

5. GNW Ino + Iruka

Note: This also means that she will stack with Edo Sasori/Konan/Bee/Guy/Samui/Playboy Sasuke

6. Madara + God Angel Konan

Note: even though they have exact same buff descriptions there is evidence that these buffs indeed do stack. (it's not a big difference as it's just 20%)

7. LM "Warrior Killing Intent" + Mifune (Iruka)

Note: They have similar description so I was concerned they don't stack , but they do actually.

Same goes for Fire Main "ninjutsu urge" it stacks with everything.

8. Hashirama + Skillbook Hashirama+1